chambers



FIJ. CHAMBERS. TRANSMITTER FOR SIGNALING BY ELECTROMAGNETIC WAVES.

APPLICATION FILED OCT. 31. I914.

I Patented Aug. 8, 1916.

. of oneset to a disk of another s irs "earners anion.

FREDERICK JOHN CHAMBERS, OF LONDON, ENGLAND, ASSIGNOE TO AUTOMATIC TELE- PHONE EQANUFAGTURING COMPANY LIMITED, OF LTV'FIRPOOL. TTGLAND.

TRANSMITTER FOB SIGNALING BY ELECTROMAGNETIC WAVES Specification of Letters Patent.

Patented Aug. 8, 1916.

Application filed October 31, 1914. Serial No. 869,674.

To aZZw/iomitmay concern:

Be it known that I,.FREDERIGK JOHN Gin-insane, a subject of the King of Great Britain, residing in London, England, and whose post-ofiice address is i Princes Square, London, England. have inventeda certain new and useful Improved Transmitter for Signaling by Electromagnetic Waves, of

-whiclrthe following is a specification.

ln-mv co-pending application, Serial ho.

675,190, I have des'ribed an arrangement for producing highly damped oscillations for signaling by electromagnetic waves in whatare known as shock or impact eX- citation methods. In this previous specification a multiple series sparlmgap system was shown in which each individual spark was formed between non-parallel surfaces closely adjacent, maintained substantially at a constant distance apart, the said surfaces comprising onthe one hand a set of conduct-ing disks of large heat capacity secured to but insulated from a rotating shaft,

and on the other hand stationary disks mounted on spindles parallel to the rotating shaft. According to the arrangement the current passed from a stationary disk to a closely adjacent moving disk, from the latter to a stationary disk and so on.

In the arrangement according to the present invention, two similar sets of conducting disks are secured to but insulated from shafts rotating about parallel aXes, so arranged peripheries of opposite disks of the two sets. The current passes alternately from a disk throughout the series. I

Figures 1 and 2 are respectively a plan view and elevation of a construction according to the invention, in which'a are metallic disks rotating with'the spindle Z)" but electrically insulated from it by the insulating sleeves c. The disks (4 are of the form shown in which theend plates are single disks provided with slip rings (Z for conveying current from and to the brush terminals 0 and nopies of this patent may be obtained for five cents each, by addressing the that a small air gap separates the jecting flanges are mounted on spindles b and insula edby insulating sleeves 0 The arrangement is such that both sets of disks can be set in rotation by the pulleys it and 7L2, or only one set; if both sets are in rotation the spindles must revolve in the same direction, so that adjacent portions of the peripheries of the two sets of disks are moving away from each other. The flanges on, the disks serve as electrodes between which the sparks pass, so that the discharge passes from one terminal 6 across air gaps between the flanges of the disks (1. to the flanges of the disks c until the slip ring connected to the other terminal'e is reached.

The length of the spark gap can be adjusted'by moving one set of disks a toward or away from the other set of. In the example shown this is effected by arranging the supports 7' of the spindle Z2 so as to slide in the fixed standards 9 Springs m attached to the supports f and abutting against the fixed standards g supporting the disks a press the movable supports 7 against an'adjustable set screw is. The disks can be clamped in the position set by means of the locking levers Z. It is obvious that any other suitable device might be'employed for adjusting the position of the movable disks. The number of the disks and consequently of the spark gaps in series canbe altered, when it 1s found advisable.

Having thus described my invention and the best means I know of carrying the same into practical e'fiect, I claimz- I In the transmission of wireless signals, a transmitter comprising two sets of conducting disks of large heat capacity, respectively secured to but insulated from rotatable shafts, the axes of the shafts being parallel,

Commissioner of Patents,

-Washington, D. G. 

